Analysis phase in the building-block approach, Computer Network Security

Analysis phase in the building-block approach, Computer Network Security

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QUESTION:

a) Explain four issues that are generally addressed in the Needs Analysis phase in the building-block approach to network design.

b) Sketch a typical hybrid star-bus topology paying attention how the clients and switching hubs are connected.

c)

i) What do you understand by MTTR?

ii) Deetrmine the annual downtime to the nearest hour if the availability of a network is 70%.

iii) Determine the percentage reliability of a system which suffers on average 4 failures per year over 30 days.

d) Explain fully the role of a proxy server in a network?

e) Differentiate between each of the subsequent:

i) packet-level and application-level firewall

ii) IEEE 802.11g and IEEE 802.11a

f) Given eight disks, give the one possible array configuration that will give maximum redundancy in each of RAID 0+1 and RAID 10 and show how stripes A, B, C, D, and E are written to each array. Give the total effective size of each array configuration if each disk has a size of 40 GB.

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